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NCR 744 > 2 - Air > Flashcards

2 - Air Flashcards

1
Q

Flight (FLT) DECK FAN Switch - ON

packs off/on

A
  • with all packs off, recirculated cabin air supplied to flight deck
  • with at least one pack on, fan increases flow of conditioned air supplied to flight deck
  • fan enabled in flight when windshield air is on.
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2
Q

TRIM AIR Switch - ON (what does it do)

A

master trim air valve open and flight deck, upper deck, and main deck zone trim air valves operate automatically

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3
Q

TRIM AIR Switch - OFF (5)

A
  • master trim air valve closed
  • pack output temperature in backup mode regulated to provide average flight deck temperature from 65°F (18°C) to 85°F (29°C) as selected by Flight Deck Temperature selector in AUTO
  • cabin temperature panel control of upper deck zone temperatures inhibited
  • pack controller A selected and both automatic and manual selection of pack controller B inhibited
  • if pack controller A failed, pack controller B selected automatically
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4
Q

Equipment (EQUIP) COOLING Selector - STBY (3)

A
  • ground exhaust valve closed
  • automatic control bypassed to configure system for flight; inboard exhaust valve open
  • with a single internal fault, equipment inboard exhaust valve closes and cooling system reconfigures to allow internal closed loop recirculation of cooling air
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5
Q

Equipment (EQUIP) COOLING Selector - NORM (3)

A
  • ground operation based on ambient temperature, equipment cooling air exhausted overboard, or exhausted into forward cargo compartment
  • with two or more engines running cooling air exhausted into forward cargo compartment and ground exhaust valve closed or inboard exhaust valve closed and equipment cooling air recirculated in a closed loop mode
  • with a single internal fault, equipment inboard exhaust valve closes and cooling system reconfigures to allow internal closed loop recirculation of cooling air
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6
Q

Equipment (EQUIP) COOLING Selector - OVRD (4)

A
  • inboard exhaust valve closed
  • ground exhaust valve closed
  • equipment supply valve closed; cooling air supplied through flight panels
  • smoke/override valve open; differential pressure exhausts cooling air overboard
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7
Q

High (HI) FLOW Switch - ON

A
  • all operating packs configured to high flow

* EICAS memo message PACKS HIGH FLOW displays

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8
Q

AFT CARGO Heat (HT) Switch - ON (3)

A
  • overheat shutoff valve opens to provide bleed air heat to aft and bulk cargo compartments
  • overheat shutoff valve opens and closes for overheat protection
  • temperature control valve opens and closes to maintain temperature
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9
Q

Aft Cargo Temperature (TEMP) Light

A
  • compartment temperature excessive

* overheat shutoff valve closes

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10
Q

PACK Reset (RST) Switch - push

A
  • resets pack fault protection system

* restarts pack after automatic shutdown if fault no longer exists

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11
Q

Pack System (SYS) FAULT Light

A

• pack overheat or other system fault has occurred

may illuminate briefly when automatically or manually switching from pack temperature controller A to B or B to A

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12
Q

PACKS Control Selectors - NORM

A
  • pack controller A or B selected automatically on alternate flights
  • selected controller is primary controller; selects secondary controller if primary controller fails
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13
Q

On the ground, with the engines not operating, the Equipment Cooling selector in NORM, and ambient temperatures moderate or high, the warm exhaust air is _____

With lower ambient temperatures _____

A

ducted overboard through the ground exhaust valve.

the ground exhaust valve is closed and the inboard exhaust valve opens. The warm equipment cooling
exhaust air discharges into the forward cargo compartment (the system is configured for flight)

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14
Q

There are __ temperature zones:

A 
six 
• flight deck
• upper deck
• forward and aft main deck
• forward and aft lower lobe cargo zones
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15
Q

The packs are controlled by __ identical pack temperature controllers (PTCs)

A

two, (A and B)

Control of the packs switches automatically to the other PTC at touchdown. If a PTC detects a fault in a pack channel, control of the respective pack switches to the other PTC

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16
Q

Each PTC has __ separate channels

A

three, (one for each pack)

If a PTC detects a fault in a pack channel, control of the respective pack switches to the other PTC

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17
Q

Each pack valve has __ flow rates

A

two, (normal and high)

During cruise, normal flow minimizes bleed air demand on the engine to reduce fuel consumption

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18
Q

Aft cargo heat is provided by bleed air from the ____ bleed air duct

A

center

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19
Q

Shoulder and foot heat is available ____

A

in flight

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20
Q

On the ground, with the engines not operating, the Equipment Cooling selector in NORM, and ambient temperatures moderate or high, the warm exhaust air is ____

With lower ambient temperatures ____

A

ducted overboard through the ground exhaust valve.

the ground exhaust valve is closed and the warm exhaust air is ducted into the forward cargo
compartment (system is configured for flight)

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21
Q

On the ground, when ____ the system

configures for flight.

A

one or more engines on each wing are operating

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22
Q

Positioning the Equipment Cooling selector to STBY ____

A

closes the ground exhaust valve to manually configure the airplane for flight

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23
Q

With the Equipment Cooling selector in NORM or STBY, the system normally
configures to ____ if a single internal fan fails.

A

closed loop mode

In closed loop mode, the inboard exhaust valve is closed

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24
Q

With _____ operating, the flight deck equipment cooling source valve directs conditioned air into the flight deck electrical equipment

A

two or three packs

The equipment cooling system provides cooling air for flight deck equipment and the electrical and electronic (E &E) compartment equipment racks.

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25
Q

With the Equipment Cooling selector in NORM, the airplane on the ground, and _____, the EICAS alert message _____ is displayed if the equipment cooling system is not configured for flight

A

one or more engines on each wing operating

EQUIP COOLING

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26
Q

With the Equipment Cooling selector in ____, the internal fans are not powered and the _______ opens with all other valves closed.

A

OVRD

smoke/override valve

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27
Q

The smoke/override valve opens to an overboard vent allowing ________ to draw air from the panels area on the flight deck, through the equipment cooling ducts to the E &E compartment equipment racks, to create a _______ of air across the equipment, then through the supply duct, and overboard

A

cabin differential pressure

reverse flow

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28
Q

___ outflow valves are installed at ____ of the cabin.

A

Two

the rear

The valves normally operate in parallel. Cabin altitude and full ventilation rates can be maintained by either valve

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29
Q

There are ___ cabin altitude controllers

A

two (A and B)

Each controller controls both outflow valves

30
Q

maximum cabin altitude is _____

A

8,000 ft

31
Q

At touchdown, the outflow valves ____ to ____ the cabin

A

open

depressurize

32
Q

The cabin altitude limiter closes both outflow valves if cabin altitude exceeds

A

11,000 ft

33
Q

___ mechanical positive pressure relief valves located ____ prevent overpressurization of the airplane.

A

Two

on the left side of the fuselage

Pack two shuts down to assist in relieving excess cabin pressure

34
Q

Negative pressure relief valves located _____ open when the airplane cabin pressure is slightly less than outside air pressure.

A

in the side cargo door and the forward and aft cargo doors

The valves also open to relieve any existing differential pressure when a cargo door is unlatched

35
Q

Bleed air can be supplied by? (3)

A

engines

APU

ground air source

36
Q

Bleed air is used for: (9/10)

A 
• air conditioning
• pressurization
• wing and engine anti–ice
• engine start
• leading edge flaps
• aft cargo heat
• hydraulic reservoir 
pressurization
• potable water tank 
pressurization
• air driven hydraulic demand 
pumps
• thrust reversers
37
Q

Engine bleed air is supplied from either the ___ or ___ engine sections.

A

IP or HP

IP air is used during high power setting operations. HP air is used during descent and other low power setting operations

38
Q

To prevent damage to ducting and equipment downstream, the ___ limits bleed air pressure.

A

PRV (Pressure Regulating Valve)

The fan air precooler regulates bleed air temperature

39
Q

During engine start, the engine bleed air valve opens and allows ____ of air from the bleed air duct to open the start valve. The ____ is positively closed to prevent reverse air flow into the engine compressor sections. Any time the engine start valve is not fully closed, the ____ remains positively closed

A

reverse flow

PRV

PRV

40
Q

After N2 increases past ____, the start valve closes which enables the ____ to open

A

50%

PRV

41
Q

If the engine start valve fails to close, bleed air is isolated from the engine starter because both the ____ and the ____ remain closed.

A

PRV

engine bleed air valve

Nacelle anti-ice is not available for the respective engine

42
Q

If an Engine Bleed Air switch is off what 3 valves are closed?

A

engine bleed air valve

PRV

HP bleed valve

43
Q

If a bleed air overheat is detected, the ____ and ____ valves close.

A

PRV and HP bleed

Pushing an Engine Bleed Air switch from off to ON resets the engine bleed fault detection system

44
Q

Bleed air is available for thrust reverser operation (GE) with the Engine Bleed Air
switch either ON or OFF except when: (3)

A
  • the PRV has failed closed
  • the PRV has been closed due a bleed air overheat
  • the start valve is not closed
45
Q

The EICAS memo message APU RUNNING is displayed when ____

A

APU N1 is 95% and higher

46
Q

Bleed duct overheat protection is provided in the APU bleed air system to detect leaks. If the APU shuts down for an overheat, _____

A

it cannot be restarted

47
Q

The left and right isolation valves separate the bleed air duct into ___ sections when closed?

A

3

left, center, right

48
Q

If the center duct section is isolated ____ and ____ are not available

A

potable water pressurization

cargo smoke detection

49
Q

If the left or right duct section is isolated, what happens to the leading edge flaps?

A

operate electrically in secondary mode

isolated because of duct leak so engine bleeds on that side are switched off

50
Q

What causes a BLEED EICAS message?

A

bleed overpressure

PRV or HP bleed valve fail to close

51
Q

What is powered by bleed air? (10)

A 
• air conditioning
• pressurization
• wing and engine anti–ice
• engine start
• leading edge flaps
• aft cargo heat
• hydraulic reservoir 
pressurization
• potable water tank 
pressurization
• air driven hydraulic demand 
pumps
• thrust reversers
52
Q

Pressing the Landing Altitude (LDG ALT) Switch displays ____ on Primary EICAS?

Manual -

Auto -

Set automatically from _____

A

landing altitude - MAN

(the EICAS advisory message LANDING ALTITUDE is displayed)

landing altitude - AUTO

(landing altitude from FMC)

53
Q

What happens with the Cabin Altitude AUTO Selector in NORM? (2)

A
  • cabin altitude controller A or B selected automatically on alternate flights
  • selected controller is the primary controller; selects secondary controller if primary controller fails
54
Q

Isolation (ISLN) VALVE Light - illuminated means?

A

isolation valve position disagrees with switch position

55
Q

With the APU Bleed Air Switch - ON, when does the APU Bleed valve open?

A

EICAS memo message APU RUNNING displayed

56
Q

What four things cause the Engine Bleed Air System (SYS) FAULT Lights to illuminate? (4)

A
  • overheat
  • overpressure
  • HP bleed valve open when commanded closed
  • PRV open when commanded closed
57
Q

What happens with ENGINE BLEED Air Switches - ON? (2)

A
  • engine bleed air valve opens for engine start

* engine bleed air valve, PRV, and HP bleed valve open by system logic when bleed air pressure available

58
Q

What happens with ENGINE BLEED Air Switches - OFF? (3)

A

• engine bleed air valve, PRV, and HP bleed valve closed

PRV opens for NAI

PRV and HP valve open for thrust reverse

(unless PRV closed by:)

  • prior or present bleed air overheat
  • start valve not closed
  • HP bleed valve failed open
59
Q

APU Bleed Air VALVE Light - illuminated

A

APU bleed air isolation valve position disagrees with switch position

60
Q

Does the ECS Synoptic Display show actual airflow?

A

No

Air flow displayed is generated by displayed valve positions, switch positions, and pack status. Actual air flow is not displayed, therefore the display may not represent actual system operation

61
Q

There are ___ temperature zones?

A

six

  • flight deck
  • upper deck
  • forward and aft main deck
  • forward and aft lower lobe cargo zones
62
Q

The packs are controlled by ___ identical pack temperature controllers (PTCs)

A

2

A/B

63
Q

Each pack temperature controller (PTC) has ___ separate channels, ___ for each pack

A

3/1

64
Q

Each pack valve has ___ flow rates ___ and ___

A

2

normal and high.

( during cruise, normal flow minimizes bleed air demand on the engine to reduce fuel consumption. Fuel consumption is reduced approximately 0.3% for each pack in normal flow)

65
Q

If both PTCs A and B fail, ____

A

air conditioning packs continue to operate and the pack overheat protection system continues to operate normally. Pack overheat results in a shut down

66
Q

What does the Flight Deck Fan do?

on the ground -

in flight -

A

increases flow of conditioned air to the flight deck when at least one pack is operating and supplies recirculated air to the flight deck when all packs are off

only enabled when windshield air is on

67
Q

Aft cargo heat is provided by bleed air from the ____ section of the bleed air duct

A

center

68
Q

The Aft Cargo Heat switch is normally ____ until ____ to increase ____ available for engine start

A

off

after engine start

bleed air

69
Q

Shoulder and foot heat are available only in flight. True/False

A

True

70
Q

With the Equipment Cooling selector in NORM or STBY, the system normally
configures to _____ if a single internal fan fails.

A

closed loop mode

(In closed loop mode,
the inboard exhaust valve is closed)

71
Q

On the ground, with the engines not operating, the Equipment Cooling selector in NORM, and ambient temperatures moderate or high, the warm exhaust air is ____

With lower ambient temperatures, ____

A

ducted overboard through the ground exhaust valve.

the ground exhaust valve is closed, air ducted into forward cargo and the system is configured for flight

NCR 744 (23 decks)

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